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US2730903A
Expired / Lapsed
US
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Lifting jack
Assignee: WALKER Manufacturing Co OF WISCOUSI
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Filing: 1952-08-05
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Granted: 1956-01-17
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Expires: 1972-08-05
Abstract
No abstract record available.
Inventors
- 👤 Walter C Trautman
- 👤 Lyle L Arnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:18
CPC Classifications
B; B66; B66F; B66F1/00; B66F1/02; B66F1/04; B66F1/06; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1553; Y10T74/1558; Y10T74/1587; Y10T74/1598
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-16 | 1959-07-18 | 1960-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-16 | 1963-07-18 | 1964-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-16 | 1967-07-18 | 1968-01-17 | $7700.00 | Window Closed / Lapsed |